The only other thing besides Vanguard is Retroarch. Unfortunately for some reason each part of it is separate and a whopping 60 mebabytes each., so with like 30 different things, I didn't install all of it.

edit: Apparently there is a combined all in one version but also 30 separate versions for each core.

Oh, look, an Official PSPMinis Humble Bundle topic!Humble Spooky Horror Bundle
...if you're into jumpscare-fests or whatever the heck these are supposed to be.
There's Alien Isolation, at least. Still definitely not enough.

Humble Capcom x Sega x Atlus Bundle
A bunch of old stuff, but arranged differently.
I really want to try Bionic Commando and RE4, but I don't think I want to pay $6.74/€5.65 for them, especially because the rest of the games are... those.